The nice Dell people came out and fixed it under warranty, but they were missing a part in the stuff they sent to the repair tech. The missing part was sent to me to install myself (don't worry, it's self-adhesive.) A box arrived roughly the size of those MSDN CD shipments - about 4" x 6" x an inch or more thick. Inside there was a lot of foam and other padding, and these (I added the penny for scale):

That's six little black dots on their self adhesive backing. Turned the six screw heads around the edge of my laptop from uncovered to covered:

I like the look, but why couldn't they have trusted the tech with them as part of the first repair?